I've had a Goldfish alone in a tank for about a year now and we recently decided to upgrade his tank and put in another goldfish. The problem his that the old goldfish is pretty much constntly chasing the new one around. He does not seem to be nipping his fins, but puts his nose against the other one's rear end and pushes him around the aquarium. At feeding time both fish get their fair share of the food, they are not fighting over that. I should also mention that the old goldfish is rather bigger than the new one, by about 50%. Are they fighting, or simply playing? Should I separate them?
Thanks for your help
Thanks for your help